Question

simplifique as expressões:
$a) \left \((n-4)! \atop (n-3)! \right.$$b) \left \((2n)! \atop (2n-2)! \right.$

Answer 1

A) (n - 4)! / (n - 3)! =
(n - 4)! / (n-3)(n - 4)! =
1 / (n - 3) =
$(n - 3)^{ -1}$

B) (2n)! / (2n - 2)! =
(2n)(2n - 1)(2n - 2)! / (2n - 2)! =
2n(2n-1) =
$4n^2 - 2n$

Bom dia.